Sheet-conveying mechanism for printing-presses.



F. 0. STOGKHOLM. SHEET CONVEYING MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED NOV.27,1907.

Patented Mar. 16, 1909.

UNITED STATES PATENT OFFICE.

SHEET-CONVEYING- MECHANISM For. rnm'rme-rnnssns.

Specification of Letters Patent.

Patented March 16, 1909.

Application filed November 27, 1907. SeriaLNo. 464,084.

To all whom it may concern:

.Be it known that I, FRANK C. STOOKHOLM, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Sheet-Conveying Mechanism for Printing-Presses, of whichthe following is a specification.

My invention consists of a certain imrovement in the sheet-conveyingmechan- ISIII for rinting presses forming the subject of my ettersPatent No. 667,604, dated February 5, 1901, the object of my presentinvention being to prevent smearing of the freshly printed sheets byreason of movement of a conveyer belt over the surface of thes'ame at atime when said sheets are confined under pressure between the two belts.This object I attain in the manner herein after set forth, referencebeing had to the accompanying drawing, in which- Figure -l is a View ofsufficient of a printing press and of the lower portion of the sheetconveying mechanism operating in conjunction therewith to illustrate mypresent invention; Fig. 1 is a viewof the upper portion of said sheetconveying mechanlsm, and Fig. 2 is an enlarged view of one of .the beltguiding rollers illustratingl the relation in respect to one another oft e conveyer'belts atthe time of their passage around said roller. v

In the drawing, 1 represents part of the frame of an Ordinaryhigh-Speedpress, 2 the" delivery fan or fiier'ofthe. same, and 3 a shaftconstituting, or driven from, one of the shafts of the press and havinga-sprocket wheel 4, for the reception of a chain belt 7 which drives alarger sprocket wheel 8 and passes aroun'd idler ul eys 9, 10, and 11.

The delivery mec anism of the pressis usually provided with a series ofdelivery. belts 14 disposed side by side, but hereinafter, forconvenience, but one of these belts will be referred to as the action ofall of them is the same; The belt passes around adrum or pulley 13,loosely mounted on a shaft 12 of the press, and driven at a proper rateof speed by any suitable mechanism. The belt 14 passes around a drum 25and alsoaround suitable guide pulle s 17, disposed in the course whichthe be t is designed to travel, preferably in such manner that said beltis. compelled to follow a zigzag course, as shown in t e drawing, thereturn run of the belt passing over guide ulleys 21.

In connection with the main delivery belt is employed a supplementarybelt 16, which is driven by a drum 15 on the shaft of the sprocket wheel8, and also passes around the drum 25 and the guide rollers 17, the.return run of said belt being properly directed by guide rollers22, andthe two belts being so disposed that the printed sheets are grippedbetween them and carried forward thereby to the delivery point.

So far as described, the mechanism-is the same as before, but in themechanism as patented, the two belts were always in contact with theprinted sheets during their conveyance from the drum 25 to-thepoint ofdelivery, and as it is extremely difiicult, if not impossible, to drivethe two belts always at precisely the same surface speed creeping orcrawling of one belt in respect to the other had a tendency tofsmear thefreshly printed sheets, especially at the points where the belts passedaround the pulleys, and said sheets were therefore subjected torelatively heavy pressure. I find that this objection can be overcome bymaking one of the belts narrower than the other, and recessing those ofthe guide rollers or drums which are so located that the narrower b'eltis'innermost when the belts are passing around the same, whereby, duringthe time that said narrower belt is thus assing around such drums orrollers, it wil be free from contact with the printed sheets, or willnot be pressed into forcible contact with the same, the sheet beingconfined between] the outer belt and those portions of the drum orroller which are of full diameter, as shown in Fig. 2, and thoseportions of the drum or roller being usually smoothand polished andtraveling at the same surface speed as the belt which holds the printedsheets in contact with them. In

.the' present instance I have shown the belt 16 as t e narrower belt,since the belt 14 is the main carrying or driving belt, the function ofthe belt 16 being to maintain the printed sheets in contact with saiddriving belt and preventbackward slipping of the same durmg their upwardtravel. As the printed sheets are not subjected to such heavy pressurewhen assing those of the ide rollers at which t e supplementary be t 16is the outermost of the pairas they are when passing those rollers atwhich the main or driving belt 14 is outermost, I find that the freeingof the freshly printed sheets from contact with the supplementary belt,where" said sheets pass around the latter rollers, is sufficient togrevent the smearing of said she as heretofore been experienced.

I claim ets which 1. The combination, in sheet conveying 5 mechanism forprinting .presses, of a pair of conveyor belts, one narrower than theother,

10 and the drum.

2. The combination, in sheet conveying mechanism for printing presses,of a main driving or carrying belt, a sup lementary belt cooperatingtherewith an of lesser width than the same, and guide drums or rollersfor said-belts, those of said drums or rollers at which the narrowerbelt is innermost being recessed for the rece tion of the same, wherebythe sheets are c amped between the wider belt and the drum.

In testimonywhereof, I have signed my name to this specification, in thepresence of two subscribing witnesses.

FRANK O. STOOKHOLM.

